Steel Bridge Construction
45.28 Further Illustrations of Bridges Under Construction, Showing Erection Methods
Figure 45.14 Royal Albert Bridge across River Tamar, Saltash, England, 1857. The two 455 ft (139 m) main spans, each weighing 1060 tons, were constructed on shore, ﬂoated out on pairs of barges, and hoisted about 100 ft (30 m) to their ﬁnal position using hydraulic jacks. Pier masonry was built up after each 3 ft (1 m) lift.
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Figure 45.15 Eads Bridge across the Mississippi River, St. Louis, Mo., 1873. The ﬁrst important metal arch bridge in the U.